Jawabanmu

2014-03-01T11:04:11+07:00
T1 = 28c
T2 = 78c
Δt = 78 - 28 = 50c
α = 0.000017/c
L0 = 80 m
Δl = ?
Δl =
Lo . α . Δt
80m . 0.000017/c . 50c
0.068 m
6.8 cmΔ


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